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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.dataflow.cfg.node;

import com.sun.source.tree.LiteralTree;
import com.sun.source.tree.Tree;

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A node for an integer literal. For example:
 *
 *  *   42
 * 
 */
public class IntegerLiteralNode extends ValueLiteralNode {

    /**
     * Create a new IntegerLiteralNode.
     *
     * @param t the tree for the literal value
     */
    public IntegerLiteralNode(LiteralTree t) {
        super(t);
        assert t.getKind() == Tree.Kind.INT_LITERAL;
    }

    @Override
    public Integer getValue() {
        return (Integer) tree.getValue();
    }

    @Override
    public  R accept(NodeVisitor visitor, P p) {
        return visitor.visitIntegerLiteral(this, p);
    }

    @Override
    public boolean equals(@Nullable Object obj) {
        // test that obj is a IntegerLiteralNode
        if (!(obj instanceof IntegerLiteralNode)) {
            return false;
        }
        // super method compares values
        return super.equals(obj);
    }
}